G-application-hold

Platform
1

Google recently found

to help me understanding how toggle_action can be used.

Most seems to make sense, but I still wonder why

g_application_hold (application);

is used there. Can it really happen that

static void activate_toggle_action () is interrupted? Generally GTK main loop is regarded as single-threaded?

May that be only for future GTK version, which may use treads and parallel processing?

2

Well, I think glib and gio supports threads, so maybe activate_toggle_action () can be indeed called by threads, so I will also use g_application_hold for the Nim example. Works fine already:

https://github.com/GNOME/glib/blob/master/gio/tests/gapplication-example-actions.c

proc activateToggleAction(action: SimpleAction; parameter: Variant; app: Application) =  
  app.hold
  block:
    echo format("action $1 activated", action.name)
    let state: Variant = action.state
    let b = state.boolean
    action.state = newVariantBoolean(not b)  
    echo format("state change $1 -> $2", b, not b)
  app.release
3

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